static int rsa_encrypt_wrap( void *ctx, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, size_t osize, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) { *olen = ((mbedtls_rsa_context *) ctx)->len; if( *olen > osize ) return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE ); return( mbedtls_rsa_pkcs1_encrypt( (mbedtls_rsa_context *) ctx, f_rng, p_rng, MBEDTLS_RSA_PUBLIC, ilen, input, output ) ); }
int ciphertext_from_nonce_and_id(const unsigned char *nonce, const unsigned char *id, const unsigned char *pubkey, unsigned char *ciphertext) { unsigned char plaintext[52]; memcpy(plaintext, nonce, 40); memcpy(plaintext + 40, id, 12); rsa_context rsa; init_rsa_context_with_public_key(&rsa, pubkey); #ifdef USE_MBEDTLS int ret = mbedtls_rsa_pkcs1_encrypt(&rsa, mbedtls_default_rng, nullptr, MBEDTLS_RSA_PUBLIC, 52, plaintext, ciphertext); #else int ret = rsa_pkcs1_encrypt(&rsa, RSA_PUBLIC, 52, plaintext, ciphertext); #endif rsa_free(&rsa); return ret; }
int rsaencrypt_main( int argc, char *argv[] ) { FILE *f; int ret; size_t i; mbedtls_rsa_context rsa; mbedtls_entropy_context entropy; mbedtls_ctr_drbg_context ctr_drbg; unsigned char input[1024]; unsigned char buf[512]; const char *pers = "rsa_encrypt"; mbedtls_ctr_drbg_init( &ctr_drbg ); ret = 1; if( argc != 2 ) { mbedtls_printf( "usage: rsa_encrypt <string of max 100 characters>\n" ); #if defined(_WIN32) mbedtls_printf( "\n" ); #endif goto exit; } mbedtls_printf( "\n . Seeding the random number generator..." ); fflush( stdout ); mbedtls_entropy_init( &entropy ); if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) pers, strlen( pers ) ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret ); goto exit; } mbedtls_printf( "\n . Reading public key from rsa_pub.txt" ); fflush( stdout ); if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL ) { ret = 1; mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \ " ! Please run rsa_genkey first\n\n" ); goto exit; } mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 ); if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret ); goto exit; } rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3; fclose( f ); if( strlen( argv[1] ) > 100 ) { mbedtls_printf( " Input data larger than 100 characters.\n\n" ); goto exit; } memcpy( input, argv[1], strlen( argv[1] ) ); /* * Calculate the RSA encryption of the hash. */ mbedtls_printf( "\n . Generating the RSA encrypted value" ); fflush( stdout ); if( ( ret = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, MBEDTLS_RSA_PUBLIC, strlen( argv[1] ), input, buf ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n", ret ); goto exit; } /* * Write the signature into result-enc.txt */ if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL ) { ret = 1; mbedtls_printf( " failed\n ! Could not create %s\n\n", "result-enc.txt" ); goto exit; } for( i = 0; i < rsa.len; i++ ) mbedtls_fprintf( f, "%02X%s", buf[i], ( i + 1 ) % 16 == 0 ? "\r\n" : " " ); fclose( f ); mbedtls_printf( "\n . Done (created \"%s\")\n\n", "result-enc.txt" ); exit: mbedtls_ctr_drbg_free( &ctr_drbg ); mbedtls_entropy_free( &entropy ); #if defined(_WIN32) mbedtls_printf( " + Press Enter to exit this program.\n" ); fflush( stdout ); getchar(); #endif return( ret ); }